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Merge pull request #2013 from cgwalters/prepareroot-comment

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prepare-root: Add a comment about the role of this service
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OpenShift Merge Robot 2020-02-20 18:30:05 +01:00 committed by GitHub
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src/switchroot/ostree-prepare-root.c
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@ -29,6 +29,28 @@
* Boston, MA 02111-1307, USA.
*/
/* The high level goal of ostree-prepare-root.service is to run inside
* the initial ram disk (if one is in use) and set up the `/` mountpoint
* to be the deployment root, using the ostree= kernel commandline
* argument to find the target deployment root.
*
* It's really the heart of how ostree works - basically multiple
* hardlinked chroot() targets are maintained, this one does the equivalent
* of chroot().
*
* If using systemd, an excellent reference is `man bootup`. This
* service runs Before=initrd-root-fs.target. At this point it's
* assumed that the block storage and root filesystem are mounted at
* /sysroot - i.e. /sysroot points to the *physical* root before
* this service runs. After, `/` is the deployment root.
*
* There is also a secondary mode for this service when an initrd isn't
* used - instead the binary must be statically linked (and the kernel
* must have mounted the rootfs itself) - then we set things up and
* exec the real init directly. This can be popular in embedded
* systems to increase bootup speed.
*/
#include "config.h"
#include <sys/mount.h>